/*
 * Copyright (c) 2007-2009 Strasbourg University
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Sebastien Vincent <vincent@clarinet.u-strasbg.fr>
 */

#include "ipv6-interface-address.h"

#include "ns3/assert.h"
#include "ns3/log.h"

#include <iostream>

namespace ns3
{

NS_LOG_COMPONENT_DEFINE("Ipv6InterfaceAddress");

Ipv6InterfaceAddress::Ipv6InterfaceAddress()
    : m_address(Ipv6Address()),
      m_prefix(Ipv6Prefix()),
      m_state(TENTATIVE_OPTIMISTIC),
      m_scope(HOST),
      m_onLink(true),
      m_nsDadUid(0)
{
    NS_LOG_FUNCTION(this);
}

Ipv6InterfaceAddress::Ipv6InterfaceAddress(Ipv6Address address)
{
    NS_LOG_FUNCTION(this << address);
    m_prefix = Ipv6Prefix(64);
    SetAddress(address);
    SetState(TENTATIVE_OPTIMISTIC);
    m_onLink = true;
    m_nsDadUid = 0;
}

Ipv6InterfaceAddress::Ipv6InterfaceAddress(Ipv6Address address, Ipv6Prefix prefix)
{
    NS_LOG_FUNCTION(this << address << prefix);
    m_prefix = prefix;
    SetAddress(address);
    SetState(TENTATIVE_OPTIMISTIC);
    m_onLink = true;
    m_nsDadUid = 0;
}

Ipv6InterfaceAddress::Ipv6InterfaceAddress(Ipv6Address address, Ipv6Prefix prefix, bool onLink)
{
    NS_LOG_FUNCTION(this << address << prefix << onLink);
    m_prefix = prefix;
    SetAddress(address);
    SetState(TENTATIVE_OPTIMISTIC);
    m_onLink = onLink;
    m_nsDadUid = 0;
}

Ipv6InterfaceAddress::Ipv6InterfaceAddress(const Ipv6InterfaceAddress& o)
    : m_address(o.m_address),
      m_prefix(o.m_prefix),
      m_state(o.m_state),
      m_scope(o.m_scope),
      m_onLink(o.m_onLink),
      m_nsDadUid(o.m_nsDadUid)
{
}

Ipv6InterfaceAddress::~Ipv6InterfaceAddress()
{
    NS_LOG_FUNCTION(this);
}

Ipv6Address
Ipv6InterfaceAddress::GetAddress() const
{
    NS_LOG_FUNCTION(this);
    return m_address;
}

void
Ipv6InterfaceAddress::SetAddress(Ipv6Address address)
{
    NS_LOG_FUNCTION(this << address);
    m_address = address;

    if (address.IsLocalhost())
    {
        m_scope = HOST;
        /* localhost address is always /128 prefix */
        m_prefix = Ipv6Prefix(128);
    }
    else if (address.IsLinkLocal())
    {
        m_scope = LINKLOCAL;
        /* link-local address is always /64 prefix */
        m_prefix = Ipv6Prefix(64);
    }
    else if (address.IsLinkLocalMulticast())
    {
        m_scope = LINKLOCAL;
        /* link-local multicast address is always /16 prefix */
        m_prefix = Ipv6Prefix(16);
    }
    else
    {
        m_scope = GLOBAL;
    }
}

Ipv6Prefix
Ipv6InterfaceAddress::GetPrefix() const
{
    NS_LOG_FUNCTION(this);
    return m_prefix;
}

void
Ipv6InterfaceAddress::SetState(Ipv6InterfaceAddress::State_e state)
{
    NS_LOG_FUNCTION(this << state);
    m_state = state;
}

Ipv6InterfaceAddress::State_e
Ipv6InterfaceAddress::GetState() const
{
    NS_LOG_FUNCTION(this);
    return m_state;
}

void
Ipv6InterfaceAddress::SetScope(Ipv6InterfaceAddress::Scope_e scope)
{
    NS_LOG_FUNCTION(this << scope);
    m_scope = scope;
}

Ipv6InterfaceAddress::Scope_e
Ipv6InterfaceAddress::GetScope() const
{
    NS_LOG_FUNCTION(this);
    return m_scope;
}

bool
Ipv6InterfaceAddress::IsInSameSubnet(Ipv6Address b) const
{
    NS_LOG_FUNCTION(this);

    Ipv6Address aAddr = m_address;
    aAddr = aAddr.CombinePrefix(m_prefix);
    Ipv6Address bAddr = b;
    bAddr = bAddr.CombinePrefix(m_prefix);

    if (aAddr == bAddr)
    {
        return true;
    }

    if ((bAddr.IsLinkLocalMulticast() && aAddr.IsLinkLocal()) ||
        (aAddr.IsLinkLocalMulticast() && bAddr.IsLinkLocal()))
    {
        return true;
    }

    return false;
}

std::ostream&
operator<<(std::ostream& os, const Ipv6InterfaceAddress& addr)
{
    os << "address: " << addr.GetAddress() << addr.GetPrefix() << "; scope: ";
    switch (addr.GetScope())
    {
    case Ipv6InterfaceAddress::HOST:
        os << "HOST";
        break;
    case Ipv6InterfaceAddress::LINKLOCAL:
        os << "LINK-LOCAL";
        break;
    case Ipv6InterfaceAddress::GLOBAL:
        os << "GLOBAL";
        break;
    default:
        os << "UNKNOWN";
        break;
    }
    return os;
}

uint32_t
Ipv6InterfaceAddress::GetNsDadUid() const
{
    NS_LOG_FUNCTION(this);
    return m_nsDadUid;
}

void
Ipv6InterfaceAddress::SetNsDadUid(uint32_t nsDadUid)
{
    NS_LOG_FUNCTION(this << nsDadUid);
    m_nsDadUid = nsDadUid;
}

bool
Ipv6InterfaceAddress::GetOnLink() const
{
    NS_LOG_FUNCTION(this);
    return m_onLink;
}

void
Ipv6InterfaceAddress::SetOnLink(bool onLink)
{
    NS_LOG_FUNCTION(this << onLink);
    m_onLink = onLink;
}

#if 0
void Ipv6InterfaceAddress::StartDadTimer (Ptr<Ipv6Interface> interface)
{
  NS_LOG_FUNCTION (this << interface);
  m_dadTimer.SetFunction (&Icmpv6L4Protocol::FunctionDadTimeout);
  m_dadTimer.SetArguments (interface, m_address);
  m_dadTimer.Schedule (Seconds (1));
  m_dadId = Simulator::Schedule (Seconds (1.), &Icmpv6L4Protocol::FunctionDadTimeout, interface, m_address);
}

void Ipv6InterfaceAddress::StopDadTimer ()
{
  NS_LOG_FUNCTION (this);
  m_dadTimer.Cancel ();
  Simulator::Cancel (m_dadId);
}
#endif

} /* namespace ns3 */
